8628891709 has 4 divisors (see below), whose sum is σ = 8641713916. Its totient is φ = 8616069504.

The previous prime is 8628891647. The next prime is 8628891731. The reversal of 8628891709 is 9071988268.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4532251684 + 4096640025 = 67322^2 + 64005^2 .

It is a cyclic number.

It is not a de Polignac number, because 8628891709 - 2¹⁵ = 8628858941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8628891409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6410094 + ... + 6411439.

It is an arithmetic number, because the mean of its divisors is an integer number (2160428479).

Almost surely, 2^8628891709 is an apocalyptic number.

It is an amenable number.

8628891709 is a deficient number, since it is larger than the sum of its proper divisors (12822207).

8628891709 is a wasteful number, since it uses less digits than its factorization.

8628891709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12822206.

The product of its (nonzero) digits is 3483648, while the sum is 58.

The square root of 8628891709 is about 92891.8279990226. The cubic root of 8628891709 is about 2051.0913648681.

The spelling of 8628891709 in words is "eight billion, six hundred twenty-eight million, eight hundred ninety-one thousand, seven hundred nine".